Compare star and Delta Connection.
4 Answers
Answer :
| Sr.No. | Star connection | Delta connection |
| 1. | Star connection have a neutral or star point. | Delta connection have no star or delta point. |
| 2. | Star connection do not form a close loop. | Delta connection forms a close loop. |
| 3. | One end of each three loads connected together and forms a neutral and remaining three ends are taken out connection. | One terminal of load is connected to another terminal of load and forms a closed loop and common ends are taken out for connection. |
| 4. | Line voltage (VL) = √3 Phase voltage (Vph) |
Line voltage (VL) = Phase voltage (Vph)
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| 5. | Line current (IL) = Phase current (IPH) |
Line current (IL) = √3 Phase current (IPH)
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| 6. | Star connection can be use as 3 phase 3 wire system or 3 phase 4 wire system. | Delta connection can only be used as 3 phase 3 wire system. |
| 7. | Star connection is generally used in power transmission. | Delta connection is generally used in power distribution. |
| 8. | Low insulation requires as phase voltage is low. | Heavy insulation is required as line voltage is equal to phase voltage. |
| 9. |
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Answer :
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Parameter
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Star Connection
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Delta Connection
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Basic definition
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One terminal of each of the three branches are connected together to form a common point. Such a connection is known as Star Connection
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The three branches of the network are connected in such a way that it forms a closed loop. Such a connection is known as Delta Connection
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Connection of terminals
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The similar ends of the three coils are connected together to form a common point.
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The end of each coil is connected to the starting point of the other coil that means the opposite terminals of the coils are connected together to form a closed loop.
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Neutral point
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Neutral or the star point exists in the star connection.
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Neutral point does not exist in the delta connection.
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Relation between line and phase current
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Line current is equal to the Phase current.
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Line current is equal to √3 times the Phase Current.
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Relation between line and phase voltage
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Line voltage is equal to √3 times the Phase Voltage
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Line voltage is equal to the Phase voltage.
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Diagram
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Answer :
Compare Star and Delta connected system:
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Star connected system
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Delta connected system
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In STAR connection, the starting or finishing ends (Similar ends) of three coils are connected together to form the neutral point. A common wire is taken out from the neutral point which is called Neutral.
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In DELTA connection, the opposite ends of three coils are connected together. In other words, the end of each coil is connected with the start of another coil, and three wires are taken out from the coil joints
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There is a Neutral or Star Point
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No Neutral Point in Delta Connection.
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Three phase four wire system is derived from Star Connections (3- Phase, 4 Wires System) We may Also derived 3 Phase 3 Wire System from Star Connection.
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Three phase three wire system is derived from Delta Connections (3- Phase, 3 Wires System)
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Line Current is Equal to Phase Current. i.e. Line Current = Phase Current
IL = IPH |
Line Voltage is Equal to Phase Voltage.
i.e. Line Voltage = Phase Voltage VL = VPH |
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Line Voltage is √3 times of Phase Voltage. i.e. VL = √3 VPH
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Line Current is √3 times of Phase Current. i.e. IL = √3 IPH
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